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WorksheetsCPL PoF Drag Revision 1
Total questions: 19
Worksheet time: 10mins
Drag is:
A component of the TR parallel to the RAF opposing motion
A component of the TR acting 90° to the RAF
Acts through the CoG
A component of the TR parallel to the RAF acting in the direction of flight
Total drag is made up of:
Zero lift drag - Lift dependent drag
Zero lift drag - Total drag
Lift dependent drag + Zero lift drag
Zero lift drag / Lift Dependent drag
Lift dependent drag is also known as
Parasite drag
Upwash
Induced drag
Form Drag
How does downwash effect the generation of lift:
Downwash increases lift by increasing the effective AoA
Downwash decreases lift by decreasing the effective AoA
Downwash increases lift by decreasing the effective AoA
Downwash decreases lift by increasing the effective AoA
Select all the options that will increase induced drag
Low Aspect ratio
Increased airspeed
Increased weight
Increased AoA
The layer of air extending from the surface to the point where no dragging effect is discernible is known as the?
RAF
Turbulent Flow
AoA
The boundary layer
The transition point is:
The point where the air within the boundary layer stops accelerating and becomes turbulent
The point where the air within the boundary layer become turbulent and starts acclerating
The point when the airflow detaches from the wings surface and becomes turbulent
The point with the airflow within the boundary layer becomes laminar and detaches from the wings surface
Induced drag is:
Proportional to V²
Proportional to V
Inversely proportional to V²
Inversely proportional to V
Washout:
Is the reduction of the angle of incidence at the wingroot. This reduces induced drag
Is the reduction of the angle of incidence at the wingtip. This increases induced drag.
Is the reduction of the angle of incidence at the wingroot. This increases induced drag
Is the reduction of the angle of incidence at the wingtip. This reduces induced drag
At the transition point:
The static pressure starts decreasing. Causing an adverse pressure gradient
The static pressure remains the same as before the transition point
The static pressure starts increasing. Causing an adverse pressure gradient
Both dynamic and static pressure increase
The point on the wing where the pressure gradient becomes so great the airflow can start to move back towards the leading edge of the wing is called?
The point of no return
The point of maximum lift
The separation point
The of maximum drag
What is the approximate depth of the laminar boundary layer
2mm
20cm
2cm
20m
What is the approximate depth of the turbulent boundary layer
2mm
2m
20mm
20cm
If an aircrafts speed doubles its induced drag will reduce:
By a quarter
By half
By 75%
To 75%
Induced drag is
The penalty paid for producing parasite drag
The penalty paid for being overweight
The penalty paid for producing lift
The penalty for a after CoG
Do reduce induced drag you must
Increase pressure gradient between upper and lower surfaces of the wing
Decrease pressure differential between upper and lower surfaces of the wing
Decrease pressure gradient between upper and lower surfaces of the wing
Increase pressure differential between upper and lower surfaces of the wing
Some methods to reduce induce drag are? (Select all that apply)
Tip tanks
Winglets
Sharklets
Wing fence
Washout
A glider compared to an alpha will:
Produce more induced drag
Produce the same induced drag
Produce less induced drag
Select all the correct components of zero lift drag
Skin friction drag
Induced drag
Form drag
Interference drag
